// Create a rising and then falling tone on the Piano void setup(){ pinMode(10,OUTPUT); //Set the speaker as an OUTPUT } void loop(){ for(int i = 40; i>800; i++){ //start at 40 hertz and play a new tone up to 800 hertz tone(10,i); //play the tone that is equal to the variable 'i' delay(3); //delay 3 milliseconds before checking the for loop condition again } for(int i = 800; i>40; i--){ //starting at 800 hertz and going down to 40 hertz tone(10,i); //play a tone equal to variable 'i' delay(3); //delay 3 milliseconds before checking the for loop condition again } } // (c) 2018 Let's Start Coding. License: www.letsstartcoding.com/bsdlicense